Testing difficulty: EASY 1. Create a new workshop instance with the access control deadlines set (open for submission, submission deadline, open for assessment and assessment deadline) 2. TEST: Make sure that the calendar events were created in course calendar for all the deadlines 3. Update the workshop setting. Disable some deadline and change the date/time of an other 4. TEST: Make sure that the events in the calendar were updated respectively Note: there is no dates validation in the form yet (so the used can define dates in wrong logical order, phases may overlap etc). This will be addressed in a separate issue.